depending on your mobile game, you could test Esetnhel 2.0 released a few months ago. supports pc, mac, ios, android, only 199 USD, but the editor is not so shiny as unity. it has a free demo version with some example projects and the tutorial samples for testing.
sometimes I do some test works in Esetnhel 1.0 (it is not available anymore, but has the same engine core as 2.0, and still can be updated). it features a very effective script package (C++) for rpg or shooters, what I want to extend towards the startegy genre, but I miss some optimization tools. its workflow is fine for me.


Free world editor for 3D Gamestudio: MapBuilder Editor